Rating: All Ages
Word Count: 7371
Author's Summary: “The Doctor is sent on a very important mission; babysitting. Yes, that's right, babysitting.”
Characters/Pairings: Fourth Doctor, K-9, other characters
Recced because: There is not enough Whofic in that odd little subgenre, "fandom characters playing with kids fic". In fact, this is the only piece I've found, but it's really worth reading.
Both the main characters are spot-on. Four, as the "childish" Doctor, was the obvious choice for this story, and he romps through it with his usual slightly bewildered buoyancy. And the little girl he has to babysit should seem very familiar to anyone who's ever dealt with four-year-olds!
There really needs to be more Whofic in this genre, but "Don't Tell Mum, the Babysitter's an Alien" is a wonderful start to the collection!